package network.sql.networkcontroller;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.*;
import android.database.sqlite.SQLiteDatabase.CursorFactory;

public class DatabaseHelper extends SQLiteOpenHelper{
	
	private static String DB_PATH = "";
	private static String DB_NAME = "";
	private SQLiteDatabase myDataBase;
	private final Context myContext;

	public DatabaseHelper(Context context) {
		super(context, DB_NAME,null,1);
		this.myContext = context;
	}

	  public void createDataBase() throws IOException{
		  
	    	boolean dbExist = checkDataBase();
	 
	    	if(dbExist){
	    		//do nothing - database already exist
	    	}else{
	 
	    		//By calling this method and empty database will be created into the default system path
	               //of your application so we are gonna be able to overwrite that database with our database.
	        	this.getReadableDatabase();
	 
	        	try {
	 
	    			copyDataBase();
	 
	    		} catch (IOException e) {
	 
	        		throw new Error("Error copying database");
	 
	        	}
	    	}
	 
	    }
	
	
	  private boolean checkDataBase(){
		  
	    	SQLiteDatabase checkDB = null;
	 
	    	try{
	    		String myPath = DB_PATH + DB_NAME;
	    		checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
	 
	    	}catch(SQLiteException e){
	 
	    		//database does't exist yet.
	 
	    	}
	 
	    	if(checkDB != null){
	 
	    		checkDB.close();
	 
	    	}
	 
	    	return checkDB != null ? true : false;
	    }
	 
	  
	  
	  private void copyDataBase() throws IOException{
		  
	    	//Open your local db as the input stream
	    	InputStream myInput = myContext.getAssets().open(DB_NAME);
	 
	    	// Path to the just created empty db
	    	String outFileName = DB_PATH + DB_NAME;
	 
	    	//Open the empty db as the output stream
	    	OutputStream myOutput = new FileOutputStream(outFileName);
	 
	    	//transfer bytes from the inputfile to the outputfile
	    	byte[] buffer = new byte[1024];
	    	int length;
	    	while ((length = myInput.read(buffer))>0){
	    		myOutput.write(buffer, 0, length);
	    	}
	 
	    	//Close the streams
	    	myOutput.flush();
	    	myOutput.close();
	    	myInput.close();
	 
	    }
	  
	  public void openDataBase() throws SQLException{
		  
	    	//Open the database
	        String myPath = DB_PATH + DB_NAME;
	    	myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
	 
	    }
	 
	    @Override
		public synchronized void close() {
	 
	    	    if(myDataBase != null)
	    		    myDataBase.close();
	 
	    	    super.close();
	 
		}
	 
		@Override
		public void onCreate(SQLiteDatabase db) {
	 
		}
	 
		@Override
		public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
	 
		}


}

